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To: Larry Garfield <larry@garfieldtech.com>, PHP internals
	<internals@lists.php.net>
Thread-Topic: [PHP-DEV] Proposal: Adding functions any(iterable $input,
 ?callable $cb = null, int $use_flags=0) and all(...)
Thread-Index: AQHWfj2/bRooGr39CkeRSgZBGY4s+alQvQSAgAAChTs=
Date: Sun, 30 Aug 2020 15:12:53 +0000
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Subject: Re: [PHP-DEV] Proposal: Adding functions any(iterable $input,
 ?callable $cb = null, int $use_flags=0) and all(...)
From: tysonandre775@hotmail.com (tyson andre)

> I like this, but I do not like the flags.=A0 I don't think they're at all=
 useful.=A0 A lot of the other discussion in the thread seems to be needles=
sly complicating it, too.=0A=
>=A0=0A=
> all() and any() only need return booleans.=A0 Their callbacks only need r=
eturn booleans.=A0 That's the point.=A0 first() makes sense to add, and it =
would return the first value that matches.=0A=
=0A=
What would first() return on failure? Would it throw (inefficient)?=0A=
Would it set an optional output reference to distinguish between returning =
the value null from an iterable and the null from no matches?=0A=
=0A=
An alternative use for a global function called first() would be to simply =
return the first element of an iterable, similar to the proposed array_valu=
e_first for arrays=0A=
=0A=
> For the callback itself, there is work to, hopefully, add partial functio=
n application to 8.1.=A0 (No idea if it will be successful, but the effort =
is in progress.)=A0 If so, the upshot is that turning an arbitrary function=
 into a single-parameter function becomes silly easy, which means functions=
 like this can just expect a single parameter callback and be done with it.=
=A0 No need for extra-args or flags or whatnot.=0A=
=0A=
> If you want to check the keys of an array, call array_keys() first and us=
e that.=0A=
> =0A=
> `if (any(array_keys($foo), fn($k) =3D> $k %2)) { ... }`=0A=
=0A=
That doesn't work for a predicate on the keys of a generator, e.g. if you w=
ant to stop calling the generator once the short-circuiting happens.=0A=
And there are occasionally situations where the predicate depends both on t=
he key and the value=0A=
=0A=
`any($itemMap, fn($enabled, $itemId) =3D> $enabled && meetsAdditionalCondit=
ion($itemId), ARRAY_FILTER_USE_BOTH)`=0A=
=0A=
Still, since there's debate over whether to even complicate this by filteri=
ng by key,=0A=
and what the best way is to implement filtering by key, I'll probably take =
out the `int $flag =3D 0` part from the initial RFC.=0A=
Those can be added in subsequent RFCs.=0A=
=0A=
Thanks,=0A=
- Tyson=